Negative feedback, thermoregulation, control of blood glucose (insulin, glucagon, diabetes) and the kidney's role in osmoregulation.
Homeostasis is the maintenance of a constant internal environment within narrow limits, despite external change. It keeps enzymes near their optimum conditions. It works by negative feedback: a change is detected and a response reverses it back towards the set point.
Negative feedback
A general loop: receptor detects a deviation → coordinator (nervous/hormonal) → effector brings about a response → the change is reversed. (Contrast positive feedback, which amplifies a change, e.g. in blood clotting.)
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